Pedregon Corporation has provided the following information:

	Cost per Unit			Cost per Period
Direct materials	$	6.50
Direct labor	$	3.40
Variable manufacturing overhead	$	1.30
Fixed manufacturing overhead				$	18,700
Sales commissions	$	0.50
Variable administrative expense	$	0.55
Fixed selling and administrative expense				$	5,200

If the selling price is $20.40 per unit, the contribution margin per unit sold is closest to: